Telephone-support



(No Model.)

N. G. WARTH.

TELEPHONE SUPPORT.

Patented May 27 1884.

r 1 W 2 2 I @TNESSES: INVENTOR:

BY W m ATTORNEYS.

N. PETERS. Phnlo-Lilhognpher. Wuhiugtnn. n1;

UNITED STATES PATENT OFFICE.

NATHANIEL G. WARTH, OF CANTON, OHIO.

TELEPHONE-SUPPO RT.

SPECIFICATION forming part of Letters Patent No. 299,300, dated May 27, 1884.

Application filed February 13, 1884. (No model.) i

converse while the hands are left free to ma-' nipulate the switch-board.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a perspective-view, partly in section, of the apparatus, showing the manner in which it is applied. Fig. 2 is a detail view of the head-piece, and Fig. 3 is a vertical transverse section taken on the line 00 00 in Fig. 2.

The receiving=telephone A, of ordinary wellknown construction, is supported in a fixed position, and is provided with a mouth-piece extension, B, having three branch tubes, a b c, for receiving flexible tubes 0 D E. Acurved spring, F, of approximately semicircular form, is jointed to a similar spring, G, and these two springs are maintained in a fixed position in relation to each other by the curved brace d, which is made adjustable by having several holes, through any one of which a screw may be inserted in the spring F. At the end of the spring G there are several holes for receiving a screw which enters the end of the brace d. This provision for adjustment is rediflerent users.

Attached to the ends of the curved spring F are ear-pieces HH, provided, respectively, with tubes 6 6, having branches f f. The 5 tube 6 of the ear-piece H communicates by means of the flexible tube 0 with the central tube, a, of the extension B on the receivingtelephone, and a tube, 0, connected with the branch f, communicates with the tube c of the 50 ear-piece H, and the branch f of the said tube communicates by means of the flexible tube quired to adapt the apparatus to the heads of.

G with a mouth-piece, I, secured to the center of the spring G. By means of this arrangement of the curved springs F G, the ear-pieces and the mouth-piece are held in position for use. The branch 0 of the extension B is connected by a flexible tube, E, with the telephonetransm-itter K. An earpiece, H, similar to the ear-pieces H H, is provided with a flexi- Ble tube, D, by which it may be connected with ond person to listen. The ear-piece consists of a diaphragm-cell, g, having a resonant chamber, h, and a chambered cap, t, provided with a small central orifice for the escape of sound.

In the cell 9 is mounted a diaphragm, j, made of a very thin-plate of mica or other similar material, and capable of being moved by the vibrations of the air in the flexible tubes,

of the diaphragm in the receiver A.

are communicated to the ear through the extension B, tubes 0 O, and the ear-pieces H H, and speech uttered in the mouth-piece I affects not only the transmitter through the pipes 0 O, O, and E, but also the receiver, which thus acts as a transmitter also, and augments the volume of sound transmitted. Should the impulses transmitted through the tubes be so violent as to affect the transmitter unfavorably, the tube D may be removed from the branch 2), allowing a part of the sound to escape through the branch.

To prevent any accidental jerking of the apparatus from the head of the user, I have placed a ring, k, on the flexible pipe 0, and provided a hook or clasp-pin, Z, by which the tube may be attached to the clothing at the shoulder. The flexible tube is formed upon or within a wire spiral to prevent kinking.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with the receiving-telephone A, of two ear-pieces, H H, the curved spring F, for holding the said ear-pieces to the ears, and the tubes 0 C, connecting the earpieces and receiver, as described.

2. The combination of the ear-pieces H H and mouth-piece I with the frame composed of the curved springs F G and brace d, as described.

a branch, I), of the extension B, to enable asecthe air itself being vibrated by the movement Sounds produced by the receiver-diaphragm 3. The combination, with the receiving-telepieceH being provided with the diaphragm phone A and transmitting-telephone K, of the j, the month-piece I, and the connecting-tubes 1o ear-pieces H H, mouth-piece I, and the con- 0 O G D E, substantially as herein shown and necting-tubes O, G, C, and E, as described. 7 described. 5 4. Thecombinatiomwith thereceivingte1e- NATHANIEL G. XVARTH.

phone A, provided with the extension B, hav- Vitnesses: ing branches a b c, and the tmnsniitting-tele- JOHN S. LOWE, [I s.] phone K, of the ear-pieces H H H, the ear- IRA XV. FISHER. [1 s.] 

